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TPS389C03-Q1: Watchdog stuck in IDLE state

Arthur Yang
Prodigy 20 points
Part Number: TPS389C03-Q1


Tool/software:

Hi, E2E support friends

I'm using the TPS389C03-Q1 as a system power monitor and watchdog. After powering on the system, I've noticed that the watchdog remains in the IDLE state. The BANK0 and BANK1 registers can be read and written normally.
In the system hardware design, the WDE pin is directly connected to a high level. My question is, is an edge trigger (like WDE L->H) required for the watchdog to transition from the IDLE state to the STARTUP state?

Thanks!

Arthur

  • 0
    TI__Expert 4440 points

    Hi Arthur,

    Thanks for your question!

    The WDE pin should be level triggered, so logic high and low inputs determine the state it is in.

    For further support, could you please provide the following:

    1. Can you please confirm the exact part number you are working with?

    2. What is the status of bank 0, register 0x37 as shown below?

    3. What voltage level do you pull the WDE pin up to? 

    Best Regards,

    Andrew Li

  • 0 in reply to Andrew Li
    Prodigy 20 points

    Hi, Andrew

    Thanks for your kindly support. 

    1. Can you please confirm the exact part number you are working with?

    We checked the part number used and I think we made a mistake and we ordered the wrong part (TPS389006007RTER).

    I am currently waiting for the new part to arrive and will try again after replacing it.

    thank you again!

    Arthur

  • 0 in reply to Arthur Yang
    TI__Expert 4440 points

    Hi Arthur,

    Thanks for the update!

    Please let me know if you have any further questions.

    Best Regards,

    Andrew Li

  • 0 in reply to Andrew Li
    Prodigy 20 points

    Hi, Andrew

    I mark this discussion as "This resolved my issue". Any further questions, I will start another thread. 

    Thanks!

    Best regards, 

    Arthur